Players complained about this guy a week ago, and again complained today with the same symptoms.  A week ago I couldn't find any stats.  Now I think they are there.  The claim was he is one-hitting WAY too much with the M240.  Yep...  born out by battlereport.

http://prntscr.com/mabfxz

48% KPH w/ M240b: http://battlelog.battlefield.com/bf4/battlereport/show/1/1087480801860373312/241053393/

41:10, 24HS using AK12: http://battlelog.battlefield.com/bf4/battlereport/show/1/1086218588780517504/241053393/

69% KPH with A-91: http://battlelog.battlefield.com/bf4/battlereport/show/1/1085938356148241216/241053393/